Custom Render Stamp, python newline
Newline using \n

\n in Python is the newline character.

Execute the lines in python.

import bpy
bpy.context.scene.render.stamp_note_text = "Line 1.\nLine2."


You will see a nondisplayable character show up in the note field of the stamp. (It is a newline character, which can't display in a single line textbox.) Rendering it, properly display the newline.





Automatic wrapping


  As of 2.77 the note will be wrapped onto new lines [...]


This refers to too long text snippes being automatically wrapped. A test seems to show a limit in characters though.